| Value | Category | Cases | |
|---|---|---|---|
| 1 | no difficulty | 8011 |
61.9%
|
| 2 | some difficulty | 3394 |
26.2%
|
| 3 | a lot of difficulty | 1445 |
11.2%
|
| 4 | cannot do at all | 96 |
0.7%
|
| 8 | don't know | 3 |
0%
|